Time calculator



Jan. 8, 1924.

1,480,156 J. T. DENNIS. JR

TIME CALCULATOR Filed July 13. 1922 2 Sheets-Sheet l J. T. DENNIS, JR

Jan. 8 1924.

T IME CALCULATOR Filed July 13. 1922 2 Sheets-Sheet 2 I J I 1 Patented Jan. 8, 1924.

UNITED STATES JOHN T. DENNIS, JIL, OF ELBERTON, GEORGIA.

TIME CALCULATOR.

Application filed July 13, 1522.

To all whomz't may com-(mt:

Be it known that I, JOHN T. DENNIS, Jr., a citizen of the United States, residing at Elberton, in the county of Elbert and State of Georgia, have invented a new and useful Time Calculator, of which the following is a specification.

This invention relates to mechanical time calculators.

The primary object of the invention is to provide a simple and efficient device of this character which will give the difference in time between two given dates by simply moving one member on another without requiring any mental effort on the part of the operator.

Another object it to so construct a device of this character as to show accurately the time in leap year or non leap years, and whether any date is a Sunday or a holiday without requiring calculation on the part of the user.

Another object is to provide a device of this character with which the time between some date in one month is figured forward to some future date within the succeeding eleven months and said time accurately shown by the shifting of one member on another without calculation by the user.

Another object is to provide a device of this character in which a table of especially arranged sets of figures is employed in connection with a member slidable thereover and having a specialarrangement of dates thereon to cooperate with the figures of the said table whereby a single movement only of the sliding member is required to properly place the dates and figures for instant reading.

Another object is to provide a stationary member bearing on its face especially arranged sets of figures over which is mounted for longitudinal sliding movement a slotted sheet-like plate or card carrying cooperating dates adjacent the edges of the slots which are designed to cooperate with the figures of the table on the sliding of the card back and forth to furnish the correct time between two ditferent dates on the card.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood Serial No. 574,715.

that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings Figure 1 represents a plan view of a de vice constructed in accordance with this invention, with the parts shown in position for illustrating the use of the device, and

Fig. 2 is a plan view of the stationary member of the device.

In the embodiment illustrated, the device constituting this invention comprises a permanent or stationary board or plate 100, here shown rectangular in form and having arranged on one face twelve printed or en graved columns of result or answer figures indicated by the numerals 1 to 12 respectively. The twelve vertical columns of figures are arbitrarily arranged in their relations one to the other so that in some columns the variations in the parallel index or resultant numbers is thirty, and in others it is thirty-one days. This variation is made in order to take care of the variations in the number of days in any consecutive twelve months.

The column 1 contains figures from 1 to 31, the figure 1 being arranged midway the length of the column and has above it an index point 14 represented by a star or asterisk which is designed for use in conjunction with the sliding member of the device presently to be described.

The column 1 contains figures from 1 to 31 inclusive, and the last figure 31 is arranged two figure spaces above the final figure in column 2.

Column 2 contains figures from 1 to 63 inclusive, the upper figure 1 of which is arranged two figure spaces below the top figures of columns 4 to 12 inclusive.

Column 3 contains figures arranged in succession from 31 to 94 both inclusive, and the top figure 31 thereof is located one figure space below that of column Land one above that of column 2.

In column 4, the figures range consecu tively from to 124 inclusive. Column 5 contains figures ranging from 91 to 155 inelusive, while column 6 has figures ranging from 122 to 186. Column 7 has figures ranging successively from 152 to 216. In column 8 the figures range from 182 to 246. Column 9 contains figures from 213 to 277, and

all

column 10 has figures ranging from to Column 11 has figures ranging from 27 l-to 338 while the final column 12 has figures ranging from 305 to 366. The final column 12 has its lowermost figure 366 arranged three figure spaces above that of the adjacent column. The figures ot the respective columns are arranged in transversealinement and are designed for cooperation with dates carried by the sliding member 15 presently to be described.

The board 100 is equipped along its side edges with suitable guides 13 on which the slide 15 is designed to travel, said slide being movable longitudinally relatively to the board.

Twelve sliding cards 15 are designed for use in connectionwith the board 100, one being employed for each month. The card 15 here shown is for the month of May 1922, and has the word May heading the first date column thereof and the succeeding eleven months following it with dates arranged under thc'name of each month in vertical columns. 7

The twelve monthly columns are numbered from 16 to 27 respectively and it will be observed that they cover a period 01": three hundred sixty-five days.

Thesemonthly columns each contains the letters of the days of the week arranged in consecutive order with numerals arranged opposite them according to the number of days contained in the respective months, vtor instance, the first column which is for May has the numerals from 1 to 81 arranged in vertical alinement with thedays of the week opposite Monday having been the first day of the month the letter M is arranged opposite the numeral 1 and so on with the other months. 7

This May card is usedonly when the time between some date in the month of May 1922 is figured forward to some future date within the succeeding eleven months. If

the time is to be figuredtrom some date in June, the card would be removed from the slide and the el une card for 1922 inserted. Likewise the cards for July and August or any one of the, subsequent months would be inserted in theslide, which overlies the table board 100 when the time is to be calculated from any date within one of these months to some succeeding date within an eleven. months period.

It will be readily seen that because of the variation in the number of days in the several months and the fact that the different days of eachinonth'fall on different daysof the week it is necessary to have a card for each. month inorder to avoid mental. calculation, particularly when, the

period of time to be determined runs from one year to a succeeding-year. This device overcomes all these dificulties and shows accurately the time in leap years and non leap years and also shows accurately whether any date falls on Sunday or a holiday since Sundays and holidays are to be shown in diilereht colors so that they will be readily seen at a glance.

The arrangement of the days on the sliding card 15 are such that the first day of the month of May in the first column marked 16 is one date space higher than the first date of June in thenext column. It will also be noted that the first day of October is one date space higher than either the column of September or November. This raising or lowering of the corresponding dates of the months in their relations to one another is designed to take care of the difference in the number or days in a series or months so that the resultant numbers on the answer board 100 when used in conjunction with the cards 15 will show accurately the number of days between tWo given dates appearing on the several cards. each twelve month combination of months requiring a separate card as above set forth. Moreover by raising or lowering the different date columns on the cards 15, the resultant numbers on the board 100 need never to be changed and will always furnish the correct time between two different dates on any card. I

Inthe use of thisdevice, the card 15 being mounted over the board 100 to slide longitudinally thereon when it is desired to obtain the difierence in time between the date May 6 and December 22, 1922, the sliding member 15 is moved so as toposition the date of Saturday May 6 opposite the star 1 1. When the sliding card 15 is so set, glance at the column marked December and road down opposite the twenty-second of December to the right, the resultant figure 230 will be shown, which indicates that there are two hundred and thirty days between the sixth of May and the twenty-second of December.

By sliding card 15 up and down over the board 100, th index star 1 1 may be placed opposite any date in May and the difference intime between any of said dates and any succeeding date in any succeedingmonth shown on the card will be readily found with dispatch and accuracy without calculation or mental oflort and with slight possibility of error.

The twelve monthly cards 15 are provided at their upper edges with upstanding ears 29, the ear or: each card containing the name of the month for which the card is to be used in computing time, the word May being shown on the card herein illustrated.

It is of course understood that any suitable frame may be employed for mounting the stationary board 100 provided, suitable guiding means be furnished to hold the card 15 in proper relation to the board so that when inserted the various columns will be properly positioned relative to each other.

claim 1. A device of the class described comprising two substantially rectangular cards one slidable longitudinally on the other, one containing especially arranged columns of figures and the other having slots to overlie said columns and provided along the edges of said slots with cooperating columns of dates, whereby said dates and figures coop erate to furnish the correct time between two dates on the date card when one card is moved on the other a predetermined distance, said slidable card being for the month that the time is to be computed from.

2. In a device of the class described, a stationary plate having twelve printed columns of figures arranged thereon and spaced laterally from'each other, said columns being arbitrarily arranged in their relations one to the other to take care of the variations in the number of days in any consecutive twelve months, twelve slidable interchangeable v cards for use in connection with said plate,

one being employed for'each month, each of said cards being provided with a plurality of longitudinally extending laterally spaced slots and having monthly columns arranged adjacent said slots; these columns each containing letters of the days of the week arranged in consecutive order with numerals arranged opposite them according to the number of days contained in the respective months, and an index point located on the plate for use in conjunction with the sliding card.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two witnesses JOHN T. DENNIS, JR.

Witnesses:

W. W. WILsoN, H. C. MIOKEL. 

